7 Mar
2001
7 Mar
'01
10:08 p.m.
Hi all!
Just curious, but are are the prices of these Sun NVRAM timer chips
these days? I am looking for a replacement
for the old SG Thompson M48T02 chip. Here in France they are on the
order of $45-50!! What has happened
to last year's $20-28 ? Are the Dallas chips identical to the ST ones,
as concerns a Sun?
--Ralph
--
Dr. Ralph P. Sobek Disclaimer: The above ruminations are my own.
Ralph.Sobek @ irit.fr
sobek @ irit.fr http://beeline.to/genealogy/
Ph:(+33)[0]561556356 FAX:(+33)[0]561556847 http://www.irit.fr/~Ralph.Sobek/
===============================================================================
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disappear in forseeable future! AWFUL!
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7 Mar
7 Mar
11:01 p.m.
On 8 Mar, Ralph SOBEK wrote:
Hi all!
Just curious, but are are the prices of these Sun NVRAM timer chips
these days? I am looking for a replacement
for the old SG Thompson M48T02 chip. Here in France they are on the
order of $45-50!! What has happened
to last year's $20-28 ? Are the Dallas chips identical to the ST ones,
as concerns a Sun?
i'm not sure about the st one's, but i'm pretty sure that dallas have
discontinued the nvram chips as used in 4c class hardware. rather than
forking out huge sums, why no just replace the battery? i've done this
with some success. you have to bit a bit careful when carving out the
old one, but after that, it's a doddle.
--
J.F.Carter http://www.jfc.org.uk/
11:24 p.m.
On 8 Mar, To: i wrote:
why no just replace the battery? i've done this
with some success. you have to bit a bit careful when carving out the
old one, but after that, it's a doddle.
i dug this out of my bookmarks:
http://www.squirrel.com/squirrel/sun-nvram-hostid.faq.html#attach
--
J.F.Carter http://www.jfc.org.uk/
8 Mar
8 Mar
5:04 a.m.
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8:31 a.m.
I just tried using a Dremel on a Dallas Semiconductor DS1287 real time
chip pulled from a PS/2 30/286.. I went down 1/4 of an inch (halfway)
into the chip before I struck metal.. and unless you're willing to wear
out your Dremel tip by removing all of the hard plastic around the metal
batteries, I don't expect you'll have much luck with Dallas timer chips.
There is no outer plastic box; it's all solid. I wish it wasn't; it
would be neat to see one that was hollow.
Daniel
I've not tried it myself, but I am told you can cut
away the top part of
the device using (e.g.) a Dremel tool, remove the old batteries and put a
couple of cheap lithium cells in.
15 Mar
15 Mar
11:42 p.m.
The best way I've got of fixing a Dallas RTC/NVRAM was discovered by trial
and error.
Both batt contacts are on one side. Tap out each side and ignore the
batteries in the middle. One of the sides holds flatwire contacts that
run to the internal cells. They are tiny so be careful with that drill.
This process worked on the Dallas RTC/NVRAM chip I have in my Sparcstation
4/330. I have the 'real' part now but the fixed one is just as good if a
little messier in appearance.
When you have exposed the contacts, Cut them (if they haven't been
allready by the Dremel ;-0) and solder an external battery pack (3volt to
4.5volt). Works like a charm and since the new batts are likely 1.5volt
'AA' types, the clock will operate forever. Well, for an awefully long
time.
Whatever you do, don't go through the bother of trying to replace the
internal batts that way. It will take forever, and very likely you will
destroy the chip trying it.
--
-----------------------------------------------------------
Jeffrey S. Worley
President
Complete Computer Services, Inc.
30 Greenwood Rd.
Asheville, NC 28803
828-277-5959
Visit our website at HTTP://www.Real-Techs.com
THETechnoid(a)home.com
-----------------------------------------------------------
11:49 p.m.
You can use the appropriate Dallas RTC/NVRAM for the SGThompson part no
problem. Check cross-list for the correct Dallas part and order up. My
Sparc is running a Dallas chip these days.
The reason why they are expensive is that there were several years of very
low demand. About 1 1/2 years ago, all those deployed chips started
failing due to exhausted batteries. SG had stopped production and so had
Dallas. Both are ramped up for them once again and the chips are
available, but creating new production cost them a bit and they pass that
on to you plus a healthy, healthy profit to them.....
I've seen them range from $15.00 to $60.00 depending on your vendor. Try
calling Dallas Semiconductor directly. That is how I got the best price
and they are friendly people. SG Thompson is not so friendly......
Regards,,
Jeff
In <3AA7765B.7D0D7012(a)irit.fr>fr>, on 03/16/01
at 08:49 AM, Ralph SOBEK <Ralph.Sobek(a)irit.fr> said:
Hi all!
Just curious, but are are the prices of these Sun NVRAM
timer chips these
days? I am looking for a replacement
for the old SG Thompson M48T02 chip. Here in France they are on the
order of $45-50!! What has happened
to last year's $20-28 ? Are the Dallas chips identical to the ST ones,
as concerns a Sun?
--Ralph
--
Dr. Ralph P. Sobek Disclaimer: The above ruminations are
my own. Ralph.Sobek @ irit.fr
sobek @ irit.fr
http://beeline.to/genealogy/ Ph:(+33)[0]561556356 FAX:(+33)[0]561556847
http://www.irit.fr/~Ralph.Sobek/
===============================================================================
Estimates are that one-third to two-thirds of animal and plant species
will disappear in forseeable future! AWFUL!
SPAMMERS Beware:
http://www.irit.fr/~Ralph.Sobek/welcome.shtml#Mail-Warning
-<Attachment #1, unnamed (1534 bytes), text/html
7bit>-
--
-----------------------------------------------------------
Jeffrey S. Worley
President
Complete Computer Services, Inc.
30 Greenwood Rd.
Asheville, NC 28803
828-277-5959
Visit our website at HTTP://www.Real-Techs.com
THETechnoid(a)home.com
-----------------------------------------------------------
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